How to use Observable java -

i have following:

abstract class extends class c (abstract class c extends d)

private string name="";  public void setfff(double val) {      double old = fff.getavg();     fff.update(val);      listiterator<observer> = ffflisteners.listiterator();     string ss;      while (it.hasnext()) {       ss = name + this.tostring();       it.next().update("fff", fff.getvalue(), fff.getavg(), ss);     } } 

class b extends d implements observable

private string name=""; public void notifyobservers() {         for(observer observer:ffflisteners){             v=fff.getvalue();              m=fff.getavg();             observer.update("fff", v, m, (name+this.getname()));         }            } 

interface observer:

void update(string nn, double bbb, double aaa, string namethraed); 

abstract class e implements observer

class g extends e

update in class g following

public void update(string string, double v, double m, string s) {          if ((b.getclass == "g")                 && string.equals("fff")&& (s.equals("b"))) {               this.ffflist.add(m);             system.out.println("list of fff :" + ffflist);          }     mymethod(ffflist); } 

i want value of m , put theme in list ffflist when notification e. how can that?

extend interface:

void update(object sender, string nn, double bbb, double aaa, string namethraed); 

in special case can check if sender instance of class e.

if(sender instanceof e){ ... } 

hope you. , please refactor parameters:)